Our work does not end on writing an application and deploying it to target the execution environment. It is possible to write an application, which after deployment will not require any further maintenance, although it is very unlikely. In reality, we need to ensure that it is properly observed for errors and performance.
To be sure that your product works as expected, you need to properly handle application logs and monitor the necessary application metrics. This often includes the following:
- Monitoring web application access logs for various HTTP status codes
- A collection of process logs that may contain information about runtime errors and various warnings
- Monitoring usage of system resources (CPU load, memory, network traffic, I/O performance, disk usage, and so on) on the remote hosts where the application is run
- Monitoring application...
